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Abstract
Economic evaluations of the benefits of integrated weed management often only consider the benefits of
management in the crop phase, and ignore the impact of rotational options. In particular, non-crop phases such
as annual and perennial pasture phases can have a substantial impact upon weed population dynamics and
economic returns. Moreover, extended perennial pasture phases are being promoted to address a range of onfarm
sustainability issues such as excessive deep drainage (i.e. salinity), runoff and soil erosion. A stochastic
bioeconomic model is developed to evaluate potential trade-offs and synergies between the goals of long-term
weed management and achieving sustainability goals.